ok removed trigger and cleaned, (twice) will fire both barrels if shooting ground levels up to 45 degrees, 45 to an overhead shot it is a single shot. Think it may be a weak spring. Same results no matter which barrel is selected to fire first.

Help.

Are you sure you're not shooting a M12 3" Superspeed gun? Comon malady for them, which I don't think was ever resolved.

The model 12 heavy duck had issues with the feeding of shells on overhead shots( shells falling out of ejection port), the problem was fixed with a guide on the carrier. My current problem is quite different.